package com.zhoukx.netty.codec2;

import com.zhoukx.netty.codec.StudentPOJO;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

import java.util.Random;

public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    /**
     *  当管道就绪,就会触发该方法
     * @param ctx
     * @throws Exception
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        //随机发送Student或者workder对象
        int nextInt = new Random().nextInt(3);
        MyDataInfo.MyMessage myMessage = null;
        if (0 == nextInt) {
            myMessage = MyDataInfo.MyMessage.newBuilder().setDataType(MyDataInfo.MyMessage.DataType.StudentType)
                    .setStudent(MyDataInfo.Student.newBuilder().setId(5).setName("凯旋").build()).build();
        }else {
            myMessage = MyDataInfo.MyMessage.newBuilder().setDataType(MyDataInfo.MyMessage.DataType.WorkerType)
                    .setWorker(MyDataInfo.Worker.newBuilder().setName("张三").setAge(26).build()).build();
        }

        ctx.writeAndFlush(myMessage);
    }


    /**
     *  当通道有读取事件时会触发
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf)msg;
        System.out.println(" 服务器回复消息: " + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器地址: " + ctx.channel().remoteAddress());
    }

    /**
     *  异常处理
     * @param ctx
     * @param cause
     * @throws Exception
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
